#!/usr/bin/env node

require('dotenv').config({ path: '.env.local' });
const AWS = require('aws-sdk');
const { v4: uuidv4 } = require('uuid');
const fs = require('fs');
const path = require('path');

// Configure AWS
AWS.config.update({
  region: process.env.AWS_REGION || 'eu-central-1'
});

const dynamodb = new AWS.DynamoDB.DocumentClient();
const TABLE_NAME = process.env.DYNAMODB_TABLE_NAME || 'filamenteka-filaments';

async function clearTable() {
  console.log(`Clearing all items from ${TABLE_NAME}...`);
  
  try {
    // First, scan to get all items
    const scanParams = {
      TableName: TABLE_NAME,
      ProjectionExpression: 'id'
    };
    
    const items = [];
    let lastEvaluatedKey = null;
    
    do {
      if (lastEvaluatedKey) {
        scanParams.ExclusiveStartKey = lastEvaluatedKey;
      }
      
      const result = await dynamodb.scan(scanParams).promise();
      items.push(...result.Items);
      lastEvaluatedKey = result.LastEvaluatedKey;
    } while (lastEvaluatedKey);
    
    console.log(`Found ${items.length} items to delete`);
    
    if (items.length === 0) {
      console.log('Table is already empty');
      return;
    }
    
    // Delete in batches of 25
    const chunks = [];
    for (let i = 0; i < items.length; i += 25) {
      chunks.push(items.slice(i, i + 25));
    }
    
    for (const chunk of chunks) {
      const params = {
        RequestItems: {
          [TABLE_NAME]: chunk.map(item => ({
            DeleteRequest: { Key: { id: item.id } }
          }))
        }
      };
      
      await dynamodb.batchWrite(params).promise();
      console.log(`Deleted ${chunk.length} items`);
    }
    
    console.log('Table cleared successfully!');
  } catch (error) {
    console.error('Error clearing table:', error);
    throw error;
  }
}

async function importData() {
  console.log('Importing data from PDF...');
  
  try {
    // Read the PDF data
    const pdfData = JSON.parse(
      fs.readFileSync(path.join(__dirname, 'pdf-filaments.json'), 'utf8')
    );
    
    console.log(`Found ${pdfData.length} filaments to import`);
    
    // Process each filament
    const timestamp = new Date().toISOString();
    const processedFilaments = pdfData.map(filament => {
      // Determine status based on vakum and otvoreno fields
      let status = 'new';
      if (filament.otvoreno && filament.otvoreno.toLowerCase().includes('otvorena')) {
        status = 'opened';
      } else if (filament.refill && filament.refill.toLowerCase() === 'da') {
        status = 'refill';
      }
      
      // Clean up finish field - if empty, default to "Basic"
      const finish = filament.finish || 'Basic';
      
      return {
        id: uuidv4(),
        ...filament,
        finish,
        status,
        createdAt: timestamp,
        updatedAt: timestamp
      };
    });
    
    // Import to DynamoDB in batches
    const chunks = [];
    for (let i = 0; i < processedFilaments.length; i += 25) {
      chunks.push(processedFilaments.slice(i, i + 25));
    }
    
    let totalImported = 0;
    for (const chunk of chunks) {
      const params = {
        RequestItems: {
          [TABLE_NAME]: chunk.map(item => ({
            PutRequest: { Item: item }
          }))
        }
      };
      
      await dynamodb.batchWrite(params).promise();
      totalImported += chunk.length;
      console.log(`Imported ${totalImported}/${processedFilaments.length} items`);
    }
    
    console.log('Import completed successfully!');
    
    // Verify the import
    const scanParams = {
      TableName: TABLE_NAME,
      Select: 'COUNT'
    };
    
    const result = await dynamodb.scan(scanParams).promise();
    console.log(`\nVerification: ${result.Count} total items now in DynamoDB`);
    
    // Show sample data
    const sampleParams = {
      TableName: TABLE_NAME,
      Limit: 3
    };
    
    const sampleResult = await dynamodb.scan(sampleParams).promise();
    console.log('\nSample imported data:');
    sampleResult.Items.forEach(item => {
      console.log(`- ${item.brand} ${item.tip} ${item.finish} - ${item.boja} (${item.status})`);
    });
    
  } catch (error) {
    console.error('Error importing data:', error);
    throw error;
  }
}

async function main() {
  try {
    console.log('PDF Data Import Tool');
    console.log('===================');
    
    // Clear existing data
    await clearTable();
    
    // Import new data
    await importData();
    
    console.log('\n✅ Import completed successfully!');
  } catch (error) {
    console.error('\n❌ Import failed:', error);
    process.exit(1);
  }
}

// Run if called directly
if (require.main === module) {
  main();
}